USN-1758-1 fixed vulnerabilities in Firefox. This update provides the
corresponding update for Thunderbird.

It was discovered that Firefox contained a memory safety issue. If a
user were tricked into opening a specially crafted page with the HTML
editor, a remote attacker could exploit this to execute arbitrary code
with the privileges of the user invoking the program.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

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